Chapter 21

unable can't, can't

un (no, none) + able (can) can't, incompetent
under under...below; less than, below; in the case of...
under water (the bed, the coat. Under the water, bed, clothes)/under the terms of according to? ?The terms/under the threat of being in the threat of/under the leadership( pressure) of being in? ?Under the leadership (pressure)/under control/under discussion
use, utilize, apply, use

make use of use, borrow / use up use up, use up, exhaust / come into (go out of) use start (stop) use / put sth.to a good use use something properly
used is old, second-hand; used to, used to in the past
us(e) (purpose, use) + ed (adjective suffix) useful

used to sth. (doing sth. ) (to something) has adapted, used to /used to do in the past often
It___that the earth was flat.
A. used to say B. was used to say
C. used to be said D. was used to saying
Parse answer C.Sentence meaning: It is said that the earth used to be considered flat. It is said that?It is said? ? ;used to do used to be.According to the meaning of the question, the correct answer should be C.
used to do and would do... can be used to express past habits, but the frequency of actions expressed by the former is higher and more frequent than that of the latter.It can be said that used to is used to objectively express a habitual behavior state in the past; while would only express a recurring action in the past, with a strong emotional color and a more subjective tone.Such as: I'm surprised to see you smoking, you didn't use to. I'm surprised to see you smoking, you didn't smoke in the past. In such cases, John would sit for hours without saying a word. In such cases, John would sit for hours without saying a word.

useful useful, beneficial

use (with) +ful (have?? of) useful

use utilization; purpose/used used old; used to/useless useless/user user, user/reuse re-use, recycle

Such dictionaries are very useful___ us.
A. to B. for C. with D. of
Parsing Answer B.Sentence meaning: such a dictionary is very useful to us. be useful for sb. on... useful.

(End of this chapter)

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